日期方法（获取当前日期+变量）

public class Tools {
    public static String backEndLimit(int days){
        long time = System.currentTimeMillis();
        Date date = new Date();
        SimpleDateFormat simpleDateFormat=new SimpleDateFormat("yyyy-MM-dd");
        Calendar rightNow = Calendar.getInstance();
        rightNow.setTime(date);
        rightNow.add(Calendar.DAY_OF_MONTH,days);
        Date dt1 = rightNow.getTime();
        String reStr = simpleDateFormat.format(dt1);
        return reStr;
    }

    public static void main(String[] args) {
        System.out.printf(backEndLimit(2));
    }
}